I have the 2012, with 17" wheels, titanium. I have gone close to 6000 miles and am barely getting 25MPG, if that, when calculating by hand having kept track of gallons put in , etc.

I wouldn't mind so much, but the tank is so tiny at 12.5, I can only go 300 miles before I need to fill up. I had expected much better than this. (Anyone know a trick to make your tank bigger!? :)

My drive is half freeway, half city commuting, and you would think I would get about 30MPG average, but I don't. I have tried using cruise control, SS, and other things, but nothing works.

Should I have it looked at? I am not even getting the city average, when half my time is on the freeway.

I see you live in socal and even though half your commute is highway it could be as bad a city roads if stuck in traffic and socal is notorious for that. So, if your highway driving involves a fair amount of stop-and-go driving or if the city driving has stop-and-go driving it's entirely possible to get 25mpg when the car is working properly.

The Mk3 FF gets great mileage in all conditions EXCEPT stop-and-go and in those conditions the mileage is actually pretty bad. If you do mostly stop-and-go you could see less than 20mpg...